
        function getpwd(str, pwd) {
                if (pwd == null || pwd.length <= 0) {
                    return null
                }
                ;var prand = "";
                for (var i = 0; i < pwd.length; i++) {
                    prand += pwd.charCodeAt(i).toString()
                }
                ;var sPos = Math.floor(prand.length / 5);
                var mult = parseInt(prand.charAt(sPos) + prand.charAt(sPos * 2) + prand.charAt(sPos * 3) + prand.charAt(sPos * 4) + prand.charAt(sPos * 5));
                var incr = Math.ceil(pwd.length / 2);
                var modu = Math.pow(2, 31) - 1;
                if (mult < 2) {
                    return null
                }
                ;var salt = Math.round(Math.random() * 1000000000) % 100000000;
                prand += salt;
                while (prand.length > 10) {
                    var a = prand.substring(0, 1);
                    var b = prand.substring(10, prand.length);
                    if (b.length > 10) {
                        prand = b
                    } else {
                        prand = (parseInt(a) + parseInt(b)).toString()
                    }
                }
                ;prand = (mult * prand + incr) % modu;
                var enc_chr = "";
                var enc_str = "";
                for (var i = 0; i < str.length; i++) {
                    enc_chr = parseInt(str.charCodeAt(i) ^ Math.floor((prand / modu) * 255));
                    if (enc_chr < 16) {
                        enc_str += "0" + enc_chr.toString(16)
                    } else
                        enc_str += enc_chr.toString(16);
                    prand = (mult * prand + incr) % modu
                }
                ;salt = salt.toString(16);
                while (salt.length < 8)
                    salt = "0" + salt;
                enc_str += salt;
                return enc_str
            }

